Self-lighting acetylene torch



.pilot Patented Mar. 29,- 19 32 JAMES o. noacn, or Los enemas, CALIFORNIA SELF-marinate acn'rnnun'ronon Application filed. January 7, 1980.: Serial No. 419,078.

This invention relates to a pilot burner construction for blow torches, in general.

An object of the invention is to provide for blow torches and other heating appliances,

a pilot burner construction that will enable the operator to control in a more satisfactory manner the operation of the pilotburner. thereby rendering its action more positive and dependable.

Another object of the invention is to provide a pilot burner construction which will economize'ful. This latter feature of this inventionis carried into efiect by an arrangement for momentarily increasing the fuel supply to the pilot burner at the particular time when said pilot burner is to perform the igniting function. i

The invention comprises not only a single burner together -with its operating means,'bu't also such pilot burner in combination with another pilot burner adaptedto transfer the flame provided by the first mentorch provided with the invention.

2 is alongitu'dinal mid-section on ationed pilot burner to a point some distance in advance thereof, thus igniting the flame coming from the tip of the torch to which the invention is applied.

The inventionfurther comprises the improved means for coordinating the action of the plurality of pilot burners employed in one of the embodiments thereof. a

' Other objects, advantages andfeatures of invention may hereinafter appear. 1

Referring to the accompanying drawings which illustrates what is at present deemed to be a preferred embodiment of the invention,

Fig.

Fig. larger scale of the torch shown in Fig. 1' end portions of the torchshown in Fig. l'being broken away to contract the view;

7 Fig. 3 is an elevation of the opposite sidev of the valve housing shown in Fig. 2. Fig. 4 is a fi'agmental detail of one of the arms which controls the operation of' the valve of the primary pilot burner.

Referring in detail to the drawings, the torchwhich is illustrated comprises a barrel 7 having-a main fuel supply conduit 8, aZpilot screwed into 1 is a side elevation of an acetylene end of'the barrel 7 a casting burner-supply conduit 9 which branches 0 from sa1d conduit 8'and an acetylene c0n-' duit 10. Said conduits 8, 9 and 10 are respectively provided with manually operablecontrol valves 12, 13 and 14. At the other end of the barrel, the torch is provided with the burner-tube 15 which leads to the tapered end portion 16, the latter terminatingin a burner tip 17.

Within said barrel 7 is contained a 'champipes 28 and 29 at the other side-thereof. 6

Each of these fuel pipes are formed in separable sections which, when the housing is in the operative position, are united by couplings 30', said couplings being provided to make is possible to assemble the parts conveniently. The pilot burner fuel supply pipe 9 communicates with the'burnersupply pipe 27 by means of a passage formed within a casting 36 which is externally screw threaded and over which the adjacent internally threaded end portion of the barrel 7 is screwed. A head 37 is screwed into that end of the barrel 7 before. said casting 36 is place, there being; a mixing v chamber 38 provided within said casting 36 the inner wall of which is formed by said head 37 when the parts are assembled. Said head 37 is provided with properly located in ternally'threaded openings to receive the pilot burner fuel supply pipe 27 and to receive the main fuel supply conduit 40 which leads to the burner tube 15. a

' A passage 41 conducts gas-from the supply conduit 8 to the upper portion of the mixing chamber 38 while a passage 42 conducts oxygen from the supply pipe 10 to the lower portion of said mixing chamber 38. At the other 45 is provided that is preferably integral with the burner tube 15'and .which is providedwith a passage 46 which conducts fuel from the tube 28 to a pilot burner tube 49 of a pilot burner 50.

Said casting 45 is also provided with a' passage 51 .which conductsfuel from the pipe 29 to the primary pilot burner 52, said burner int being provided with a burner tip 53 and a valve 54. The chamber 26 is provided with an outlet port 60 through which the fuel is supplied for the primary pilot burner 52. Said port 60 is controlled by a tapered valve (31 having anoperating stem 62" which ex tends through and has a working fit within the opposite wall of the casing 25. Around said stem 62 is coiled a compression spring (33 which tends to seat said valve 61.

Above said port (50, port also leads from the chamber-'26, said port 70 furnishing fuel to the auxiliary pilot burner 50. Said port 70 is controlled by a conical valve 71 which is provided with a stem 73 that projects through the opposite wall of the casing 25 and has a working tit therein. Around said stem 73 is coiled a compression spring 74: which tends to hold said valve 71 in the closed position.

To the upper corner of said casing 25 at one side thereof is pivoted a valve operating lever 78 which projects downward through a slot 79 in a cover plate 80 with which the lower side of barrel 7 is provided. Said lever 78 is operatively connected with the valve stem 73 by means of a rod 81. the left end portion of which as seen in Fig. 2, is deflected in order that the outer end portionof the valve stem 7 3 may extend therethrough, said valve stem 73 having nuts 82 screwed thereonto to provide means whereby through the operation of lever 7 8 and rod 81 the valve 1 may be opened against the opposition of its spring 74. v j

The opening of the lower valve 61'aga1nst the opposition of its spring 63 is securedby the provision of an operating rod 85 having a deflected end portion through which extends the outer end of said valve stem 62,

nuts 86 being provided on the end of said stem 62 against which said rod 85 abuts. The other end ofsaid rod v85 passes loosely through slot 86 in the free end of a pendant link or guide arm 87, the upper end of which is attached to the housing 25 by means of a pivot pin 26. The valve operating lever 78 is provided with a cam portion 89 which is positioned to engage the lower portion of the pendant arm 87 in such a manner, that when said lever 7 8 is moved from the full line position of Fig. 3 to the dotted line position of said view. said cam 89 will engage pendant 87 and tend to swing 1t downwardly toward a more nearly vertical position thus carrymg down with it the adjacent end of the valve.

operating rod 85. Lever 78 is also provided with a notch 90 which is sufliciently deep to 'clear the adjacent end of rod 85 when said lever 78 is moved to the limit of its right hand movement as indicated byvdotted lines in Fig. 2, it being understood that during this movement of lever 78 the guide arm 87,

owing to the engagement of cam 89 there; with, will move the adjacent end of the valvev operating rod 85 into register with said notch 90. But during the first part of the movement of said lever-78, the part 89athereof between the notch 90 and cam 89 will engage the -end of the valve operating rod 85 and cause a momentary additional opening of the valve 61.

The lower valve stem 62 has a working fit through a stufling box 92 and'the upper valve stem 73 has a working fit through the stufiing box 93 provided therefor, said stufling boxes being in the form ofinuts or externally screw threaded elements which are screwed into recesses which are provided therefor in the ieft hand wall of the casting 36 as seen in A leaf spring 850 yieldingly holds the free end of rod 85 against the upper end of the slot 86 of guide arm 87.

Nuts 62a are provided, on valve stem 62 near the outer endthereof to keep said stem 62 from moving inwardly far enough to com pletely seat the valve 61, thus providing for a continuous supply of fuel to the primary pilot burner 52. When it isdesired to shut off said burner 52 this may be done by means of the manually operable valve 54.

Ordinarily the valves 12 and 14 seen at the left of Fig. 1 will'be closed, but the valve 13 of branch pipe 9 will-be open thus supplying fuel to the pilot-valve chamber 26.

while cutting ofi the supply of fuel from the mamburner tip 17. It is to be understood that the nuts 62a .on valve stem 62 are to be so regulated. that the spring 63 of said valve can not completely close the valve, but asmall stream of' fuel will be continually issuing through the primary pilot burner 52, which will ordinarily be kept continuously burning. Under these conditions, if the operator desires to start the torch into operation, he will first open the valves 12 andlt to supply fuel and oxygen as required to the torch. He will then operate'the lever 78 thus opening the fuel supply to the auxiliary pilot burner 50 and at the same time causing a momentary increase in the amount of fuel supplied to the primary pilot valve 52.

This momentary increase of fuel to the primary pilot valve will result from the cooper- .ation of the valve operating stem 85, guide arm 87 and manually operated lever 78. The first part of the movement of said lever 78 causes the portion ofsaid lever between its cam 89 and notch 90 to engage the adjacent end of the valve operating rod 85 during the first part of the movement of said lever, but the final part ,of the movement of said lever brings its notch 90 into register with the ad jacent end of said rod 85 thus permitting the valve 61 (see Fig. 2) to. return to its closed position under the action of its spring 63.

Thebrief' inrush of additional fuel thus supplied to the primary pilot burner 52 will cause said burner 52 to flare up decidedly and will thus make-more certain the lighting to the secondary pilot burner 51, and-sald burner 51 will, in turn ignite the fuel'issuing from primary pilot burner, a secondary er positioned to be lit by said primary pilot theburner tip 17 of the, torch.

A plurality of step-up pilot burners are thus provided to advance the pilot flame to the torch tip 17 in an effective manner.

Claims: v .1. A torch provided with a main burner, a

pilot burnburner, said secondary pilot burner being positioned to light said main burner, means to continuously supply fuel to said prlmary pilot burner, and means to momentarily augment the fuel supply of said primary pilot .bnrner and simultaneonsly open afuel Supply to said-secondary pilot burner.

t 2. 1 In combimtionwith the fuel supply and main burner of burners, one of said plurality ofpilot burners being. a prim'ary pilot burner and being farther from sail torch burner than the remain der ofsaid plurality of burners, individual valves to control the fuel supply to the individual burners of said plurality of pilot burners, meanscontinuously to hold slightlyopen the valve of said primary pilot burner, and

manual operable means simultaneously to move to a more widely open'position thevalve of said primary pilot'bnrner when the remaining pilot manually operable means having a path ofburner valve is actuated, said the completion of which it is movement near disengaged from its operative relation to the valve of saidprimary pilot burner, and means automatically operating upon such disengagement to cause said valve of said primary pilot burner to return to its slightly open position, said plurality of pilot burner valves being arranged to step-up the flame from said primary pilot burner to the main burner ofthe torch;

3. In combination with the fuel supply and f mainburner of a torch, a primary pilot burner and a secondary pilot burner, said second ary pilot burner bein g adapted to step-up the pilot flame from said primary pilot burner to the main. burner of the torch, valves to control the fuel supply to each of said pilot burners, means to maintain the valve of said primary pilot burner in a slightly open condition, a manually operable lever pivotally supported at one end, means operatively connecting said lever with the valve ofsaid secondary pilot burner to open said valve whensaid lever. is operated, said lever being provided with an impinging portion and a recess adjacent thereto, and means to operate the valve of said main pilot burner, said last named means being in position to be operated by said impinging portionduring the firstpart of the movement of said lever and when said first partof the movement thereof is completed, coming into register with said recess and means for said pilot burners,

a torch,'a plurality of pilot thereby being disengaged from its operative relation to said lever.

4. In combination with the fuel supply and main burner of atorch, a secondary pilot burner positioned to light said main burner, a primary pilot burner positioned to light said secondary pilot burner, fuel supply afuel supply valve for said secondary pilot burner, a fuel supply valve for said primary pilot burner, said last mentioned valve being normally maintained in a slightly open position to keep said primary pilot burner burning, and a manually operable lever to operate both of said pilot burner valves, said lever having a continuous operative connection with the valve of said secondary pilot burner and having an operativerelation also with the valve of said primarypilot burner, the last mentioned operative relation providing for a momentary opening movement of the valve of said primary pilot burner during the first afnel supply crease the fuel supply to said primary pilot burner, said means comprising a manually operable lever.

6. In combination with the fuel supply and main burner of a torch, a secondary pilot burner positioned a fuel supply means for secondary burner,

and manually operable said pilot burners,

means to open the fuel supply to said-second ary pilot burner and simultaneously momenmary pilot burner.

prising a casing within which is contained a pilot burner fuel supply chamber, a fuel supplypipe leading to said main burner, a fuel supply pipe leading to said chamber, a primary pilot burner, a secondary pilot burner positioned to be lit by said primary burner, said secondary pilot burner being positioned to light said-,main'burner, each of said pilot to light said main burner, a primary pilot burner positioned to light said tarily increase the fuel supply to said pri- 7. A torch having a main burner and com-v burners being fed from pipes which commu- D "nicate with said chamber, a valve for each of said last recited pipes to control the supply of fuel therethrough', a common operating .means for said valves to coordinate their action,'and a manually operable element to ac tuatesfaid common operating means. v

8. A torch having a main burner andcomprising a casing within which is contained a pilot burnerfuel supply chamber, a fuel supply pipe leading to said main burner, a fuel supply pipe leading to said chamber,'a pri- 5 mary pilot burner, 21 secondary pilot burner positioned to be lit by said primary burner, said secondary pilot'burner being positioned to light said main burner, each of said pilot burners beingfed from pipes which commu-. nicate with said chamber through a Wall thereof which is directed towards said pilot burners, saidlast named pipes communicating with passages which open interiorly of said chamber, twovalveswithin said chamher, said valves each controlling one of said passages, each of said valves having a stem which projects through the wall of said casing opposite to said passages. and manually operable means connecting with the projecting portions of said valve stems to coordinately control the opening and closing of said valves. k

In testimony whereof I hereunto aifix my signature. I JAMESG. ROACH. 

